Storage pen



FIG. 1 is a perspective view of a storage pen showing my new design;

FIG. 2 is a top plan view thereof, the bottom plan view being identical;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevation view thereof; and,

FIG. 5 is a left side elevation view thereof, the right side elevationview being identical.

The ornamental design for a storage pen, as shown and described.